Manufacture of aliphatic aminosulphonic acids



Patented July 9, E

assist MANUFAQTHIRE @F ALEL HATHC Ail ENQ- SULRIHMDNKC AGNES Hans Wesche, liiessau in iinhalt, Germany, as

signer to K. G. Farbemndustrie Alrtiengesellschai't, Frankfort-on-the-Main, Germany No Drawing. Application May 22, 193$, Serial No.'275,059. In Germany May 23, 1938 3 Claims.

The present invention relates to new aliphatic amino-sulphonic acids and to a process for manufacturing the same.

The condensation of aliphatic amines with 5 f'ormaldehyde-bisulphite occurs, as is known, ac-

cording to the following equation, wherein R stands. for an aliphatic radical and M stands for a monovalent metal equivalent:

I RNH2+CH2O NIHSOz: RNH-CI-Iz OSO2M+H2O There is thus produced the sulphurous acid ester of an aliphatic substituted amino alcohol. During the condensation-of aromatic sulphamides the corresponding sulphurous acid esters are formed in the same manner.

, 'I'he present invention is based on the observation that by the condensation of aliphatic sulphamides of the general formula RSOzNH: and

. the substitution products thereof with formaldeao'hyde-blsulphites sulphonic acids are obtained according to the following equation: I .RSOzNHz-l-CHzOQWHSOsasomn cmso=m+mo a This course of the reaction could not be foreseen; it allows in a simple manner the manufacture of amino-sulphonic acids substituted in the amino group by the sulphonic acid radical There is proceededas follows: the aqueous solu- 3o tions of the sulphamide in question and, for instance, of an alkali formaldehyde bisulphite are caused to react by shortly heating. The alkali metal salts of the corresponding sulphonic acids are then obtained as bodies which readily dissolve in water and show a neutral reaction;

; these bodies may be caused to separate in known manner. Instead of an alkali formaldehyde-bisulphite another formaldehyde-bisulphite may be used with the same success, for instance,-a form- 4o aldehyde-bisulphite of magnesium or aluminium.

It is likewise possible to use mixtures of solutions of formaldehyde and .the bis'ulphite compounds 50 Example 1.-A solution of 19 parts of methylsulphamidein 20 parts of water is mixed with 'a solution of 27 parts of formaldehyde sodium bisulphite in 60 parts of water; by eliminating the water by distillation the methyl-sulphamidol6 methane sulphonic acid is obtained in the form (Ci. 26iP-513) of the sodium salt in a quantitative yield.

Erample 2.-200 parts of a mixture of aliphatic sulphamide the values of analysis of which approximately correspond to the tridecane-sulphonamide are stirred, while boiling, with 162 parts 5 of formaldehyde solution of 30 per cent. strength and 169 parts of sodium bisulphite dissolved in water. After the reaction is complete, this being recognized by the ready solubility in water of the reaction product, the product is evaporated 10 under reduced pressure and dried. 420 parts of the yellowish pulverulent product are obtained.

The stearyl-sulphonamide may be transformed in the same manner into a readily water-soluble compound having the same properties.

It may be of advantage to carry out the reac- .tion with solid formaldehyde-sodum-bisulphite in It is obvious that my invention is not limited 9 to the foregoing examples or to the specific de-.- tails given therein.v As indicated in the general formula given above generally aliphatic sulphamides may be used as starting materials which correspond to'the general formula RSOz-NI-In,

wherein R is a lower or higher alkyl radical with a branched 'or unbranched series of C-atoms.

Furthermore, instead of the formaldehyde-bisulphitecompound there may be used a soluble bisulphite salt in the presence of a compound 40 developing formaldehyde.

What I claim is: v

1. 'I'heprocess which comprises reacting an aliphatic sulphamide of the general formula -R-SO2NH, wherein R is an alkyl radical, with 

